{"api_version":"1","generated_at":"2026-08-20T13:29:05+00:00","cve":"CVE-2026-18511","urls":{"html":"https://cve.report/CVE-2026-18511","api":"https://cve.report/api/cve/CVE-2026-18511.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-18511","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-18511"},"summary":{"title":"IBM i is Affected By Multiple Vulnerabilities in Java Secure Sockets Extension","description":"IBM i 7.6, 7.5, 7.4, and 7.3 could allow a local authenticated attacker to generate a stack-based buffer overflow in the Native IBM i JSSE provider, caused by improper bounds checking during TLS session establishment. A local attacker could overflow a fixed-length buffer and execute arbitrary code on the system or cause the JVM process to crash.","state":"PUBLISHED","assigner":"ibm","published_at":"2026-08-13 21:17:45","updated_at":"2026-08-17 13:25:20"},"problem_types":["CWE-787","CWE-787 CWE-787 Out-of-bounds Write"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"psirt@us.ibm.com","type":"Secondary","score":"7.3","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","baseScore":7.3,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"LOW"}},{"version":"3.1","source":"CNA","type":"CVSS","score":"7.3","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","data":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":7.3,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","version":"3.1"}}],"references":[{"url":"https://www.ibm.com/support/pages/node/7283285","name":"https://www.ibm.com/support/pages/node/7283285","refsource":"psirt@us.ibm.com","tags":["Vendor Advisory"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-18511","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-18511","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"IBM","product":"i","version":"affected 7.6","platforms":[]},{"source":"CNA","vendor":"IBM","product":"i","version":"affected 7.5","platforms":[]},{"source":"CNA","vendor":"IBM","product":"i","version":"affected 7.4","platforms":[]},{"source":"CNA","vendor":"IBM","product":"i","version":"affected 7.3","platforms":[]}],"timeline":[],"solutions":[{"source":"CNA","title":"","value":"IBM strongly recommends addressing the vulnerability now.\n\nIBM i Release5770-JV1\nPTF Number(s)PTF Download Link(s)7.6SJ11036\nSJ11072\nSJ11082\nSJ11088 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11036 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11072 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11082 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11088 7.5SJ11068\nSJ11073\nSJ11070\nSJ11077\nSJ11087\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11068 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11073 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11070 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11077 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11087 7.4SJ11071\nSJ11069\nSJ11076\nSJ11086\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11071 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11069 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11076 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11086 7.3SJ11067\nSJ11075\nSJ11085\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11067 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11075 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11085 \n\n\n\nIBM recommends users running unsupported versions of affected products upgrade to a supported and fixed version of affected products.","time":"","lang":"en"}],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2026","cve_id":"18511","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"ibm","cpe5":"i","cpe6":"7.3","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2026","cve_id":"18511","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"ibm","cpe5":"i","cpe6":"7.4","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2026","cve_id":"18511","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"ibm","cpe5":"i","cpe6":"7.5","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2026","cve_id":"18511","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"ibm","cpe5":"i","cpe6":"7.6","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"18511","cve":"CVE-2026-18511","epss":"0.002170000","percentile":"0.124090000","score_date":"2026-08-17","updated_at":"2026-08-18 00:11:46"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2026-18511","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","timestamp":"2026-08-14T13:36:34.392328Z","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-08-14T13:48:42.524Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"cpes":["cpe:2.3:a:ibm:i:7.6:*:*:*:*:*:*:*","cpe:2.3:a:ibm:i:7.6.0:*:*:*:*:*:*:*","cpe:2.3:a:ibm:i:7.5:*:*:*:*:*:*:*","cpe:2.3:a:ibm:i:7.5.0:*:*:*:*:*:*:*","cpe:2.3:a:ibm:i:7.4:*:*:*:*:*:*:*","cpe:2.3:a:ibm:i:7.4.0:*:*:*:*:*:*:*","cpe:2.3:a:ibm:i:7.3:*:*:*:*:*:*:*","cpe:2.3:a:ibm:i:7.3.0:*:*:*:*:*:*:*"],"product":"i","vendor":"IBM","versions":[{"status":"affected","version":"7.6"},{"status":"affected","version":"7.5"},{"status":"affected","version":"7.4"},{"status":"affected","version":"7.3"}]}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<p>IBM i 7.6, 7.5, 7.4, and 7.3 could allow a local authenticated attacker to generate a stack-based buffer overflow in the Native IBM i JSSE provider, caused by improper bounds checking during TLS session establishment. A local attacker could overflow a fixed-length buffer and execute arbitrary code on the system or cause the JVM process to crash.</p>"}],"value":"IBM i 7.6, 7.5, 7.4, and 7.3 could allow a local authenticated attacker to generate a stack-based buffer overflow in the Native IBM i JSSE provider, caused by improper bounds checking during TLS session establishment. A local attacker could overflow a fixed-length buffer and execute arbitrary code on the system or cause the JVM process to crash."}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":7.3,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-787","description":"CWE-787 Out-of-bounds Write","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-08-13T20:43:37.477Z","orgId":"9a959283-ebb5-44b6-b705-dcc2bbced522","shortName":"ibm"},"references":[{"tags":["vendor-advisory","patch"],"url":"https://www.ibm.com/support/pages/node/7283285"}],"solutions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<p><strong>IBM strongly recommends addressing the vulnerability now.</strong></p><div><table><colgroup><col/><col/><col/></colgroup><thead><tr><td><strong>IBM i Release</strong></td><td><strong>5770-JV1<br/>PTF Number(s)</strong></td><td><strong>PTF Download Link(s)</strong></td></tr></thead><tbody><tr><td>7.6</td><td>SJ11036<br/>SJ11072<br/>SJ11082<br/>SJ11088</td><td><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11036\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11036</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11072\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11072</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11082\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11082</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11088\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11088</a></td></tr><tr><td>7.5</td><td>SJ11068<br/>SJ11073<br/>SJ11070<br/>SJ11077<br/>SJ11087<br/></td><td><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11068\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11068</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11073\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11073</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11070\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11070</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11077\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11077</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11087\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11087</a></td></tr><tr><td>7.4</td><td>SJ11071<br/>SJ11069<br/>SJ11076<br/>SJ11086<br/></td><td><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11071\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11071</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11069\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11069</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11076\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11076</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11086\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11086</a></td></tr><tr><td>7.3</td><td>SJ11067<br/>SJ11075<br/>SJ11085<br/></td><td><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11067\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11067</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11075\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11075</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11085\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11085</a></td></tr></tbody></table></div><p>IBM recommends users running unsupported versions of affected products upgrade to a supported and fixed version of affected products.</p>"}],"value":"IBM strongly recommends addressing the vulnerability now.\n\nIBM i Release5770-JV1\nPTF Number(s)PTF Download Link(s)7.6SJ11036\nSJ11072\nSJ11082\nSJ11088 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11036 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11072 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11082 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11088 7.5SJ11068\nSJ11073\nSJ11070\nSJ11077\nSJ11087\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11068 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11073 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11070 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11077 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11087 7.4SJ11071\nSJ11069\nSJ11076\nSJ11086\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11071 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11069 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11076 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11086 7.3SJ11067\nSJ11075\nSJ11085\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11067 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11075 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11085 \n\n\n\nIBM recommends users running unsupported versions of affected products upgrade to a supported and fixed version of affected products."}],"title":"IBM i is Affected By Multiple Vulnerabilities in Java Secure Sockets Extension"}},"cveMetadata":{"assignerOrgId":"9a959283-ebb5-44b6-b705-dcc2bbced522","assignerShortName":"ibm","cveId":"CVE-2026-18511","datePublished":"2026-08-13T20:43:37.477Z","dateReserved":"2026-07-31T17:24:47.213Z","dateUpdated":"2026-08-14T13:48:42.524Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-13 21:17:45","lastModifiedDate":"2026-08-17 13:25:20","problem_types":["CWE-787","CWE-787 CWE-787 Out-of-bounds Write"],"metrics":{"cvssMetricV31":[{"source":"psirt@us.ibm.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","baseScore":7.3,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"LOW"},"exploitabilityScore":3.9,"impactScore":3.4},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-08-14T13:36:34.392328Z","id":"CVE-2026-18511","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:ibm:i:7.3:*:*:*:*:*:*:*","matchCriteriaId":"DD4F4919-D935-4B81-B4E8-0E0F2DAC09B1"},{"vulnerable":true,"criteria":"cpe:2.3:a:ibm:i:7.4:*:*:*:*:*:*:*","matchCriteriaId":"AE2B298C-E1F6-43BD-A5EF-83964C6669CE"},{"vulnerable":true,"criteria":"cpe:2.3:a:ibm:i:7.5:*:*:*:*:*:*:*","matchCriteriaId":"88B74622-BDB2-43AE-A91F-FADEC4B64B4F"},{"vulnerable":true,"criteria":"cpe:2.3:a:ibm:i:7.6:*:*:*:*:*:*:*","matchCriteriaId":"8C189EC3-7D9F-4303-BB5C-1013FAE59B1E"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"18511","Ordinal":"1","Title":"IBM i is Affected By Multiple Vulnerabilities in Java Secure Soc","CVE":"CVE-2026-18511","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"18511","Ordinal":"1","NoteData":"IBM i 7.6, 7.5, 7.4, and 7.3 could allow a local authenticated attacker to generate a stack-based buffer overflow in the Native IBM i JSSE provider, caused by improper bounds checking during TLS session establishment. A local attacker could overflow a fixed-length buffer and execute arbitrary code on the system or cause the JVM process to crash.","Type":"Description","Title":"IBM i is Affected By Multiple Vulnerabilities in Java Secure Soc"}]}}}